If I could discuss only one nutrient for the rest of my career, vitamin C would be near the top of the list. Its reach across systems is extraordinary, and most people are operating with chronically elevated vitamin C demand without knowing it.

Vitamin C is required for collagen synthesis, histamine clearance, adrenal hormone production, glutathione recycling, connective tissue repair, immune modulation, neurotransmitter synthesis, wound healing, and cellular antioxidant protection. Stress, infections, mold exposure, environmental toxicant burden, chronic inflammation, and poor sleep all increase demand significantly.

Niacinamide is one of the nutrients I reach for most consistently in orthomolecular protocols. B3 is a direct precursor to NAD, which means it is foundational to mitochondrial energy production, cellular repair, and nervous system regulation. Without adequate NAD, the body cannot efficiently generate ATP, manage inflammation, or repair DNA.

Clinically, niacinamide shows up as a priority when I see fatigue patterns, anxiety, overstimulation, poor stress recovery, nervous system dysregulation, and mitochondrial insufficiency. It is also one of the most well-studied nutrients in the orthomolecular literature, with decades of research at higher doses.

Riboflavin is probably the most underestimated nutrient in nutrigenomics. Most people with MTHFR variants go straight to methylfolate. I go to riboflavin first.

B2 is the essential cofactor for MTHFR enzyme activity. Without adequate riboflavin, the enzyme cannot function properly regardless of what methylfolate is provided. Riboflavin also drives glutathione recycling through its role in supporting glutathione reductase, powers mitochondrial electron transport, and participates in thyroid hormone metabolism and iron mobilization. It is foundational to function in ways most protocols overlook.

Magnesium is involved in over 300 enzymatic reactions. I encounter inadequate magnesium status in the majority of people I work with, and the symptom patterns are wide-ranging: disrupted sleep, muscle tension, anxiety, fatigue, blood sugar instability, constipation, poor stress tolerance, and methylation inefficiency all show up in the context of low magnesium.

Modern agricultural practices have depleted soil magnesium significantly. Chronic stress depletes it through urinary losses. High sugar and refined carbohydrate intake accelerate excretion. Many medications also reduce magnesium status over time. It is genuinely difficult to maintain adequate tissue levels without intentional dietary or supplemental support.

Zinc is one of the most critical minerals for immune system competence, gut lining integrity, hormone metabolism, and antioxidant enzyme activity. It is a cofactor for superoxide dismutase (SOD), a key enzyme in antioxidant defense, and is essential for stomach acid production through carbonic anhydrase activity.

Zinc depletion is common in individuals with chronic stress, high copper exposure, diets low in animal protein, gut absorption issues, or frequent infections. Excess copper relative to zinc is a pattern I see regularly in genetic and symptom analysis, and it has significant downstream effects on neurotransmitter balance, estrogen metabolism, and oxidative stress load.

Phosphatidylcholine is one of my favorite nutrients for individuals whose genetic terrain and symptom pattern point toward impaired membrane function, fat metabolism, or choline pathway inefficiency. PC is the primary phospholipid in cell membranes and is essential for membrane fluidity, bile production, fat emulsification, and neurotransmitter synthesis via acetylcholine production.

PEMT gene variants reduce the body's ability to synthesize phosphatidylcholine endogenously, which increases dietary and supplemental need significantly. I prioritize this nutrient when I see PEMT variants alongside symptoms like poor fat digestion, right-sided abdominal discomfort, fatty liver markers, or impaired hormone clearance through the liver.

Phosphatidylserine becomes one of the most clinically useful nutrients when high cortisol patterns, disrupted sleep, and overstimulation are prominent. PS supports HPA axis regulation by modulating the cortisol response to stress, and it is one of the few nutrients with direct evidence for reducing exercise-induced cortisol elevation and improving cognitive recovery from chronic stress load.

I use phosphatidylserine most often in individuals presenting with difficulty winding down at night, late-evening cortisol elevation, poor sleep quality, brain fog, and stress sensitivity that is out of proportion to the actual stressor. It is a phospholipid that concentrates in brain tissue and is required for neuronal membrane function and signaling.

Trace minerals rarely get the attention they deserve. They are overshadowed by more glamorous nutrients in the supplement market, but clinically they function as essential cofactors for the enzymes driving energy production, detoxification, neurotransmitter synthesis, and tissue repair.

Selenium, manganese, molybdenum, iodine, copper, chromium, boron, and vanadium each serve specific enzymatic and structural roles. Soil depletion has made dietary acquisition increasingly unreliable. I look at mineral status carefully when addressing methylation inefficiency, thyroid dysfunction, detoxification capacity, and immune regulation. Deficiencies here are often overlooked and underappreciated as root contributors to the pattern.